Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: De qual país é o jogador Robert Karlsson do local T6?
 ###Tabelas: CREATE TABLE ppl_2004__final_standings (ppl_2004__final_standings_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Played INT, Drawn INT, Lost INT, Points INT) CREATE TABLE appearances_in_tour_de_france (appearances_in_tour_de_france_id AUTO_INCREMENT PRIMARY KEY, Year INT, Stage INT, Category VARCHAR, Start VARCHAR, Finish VARCHAR, Leader at the summit VARCHAR) CREATE TABLE year_by_year (year_by_year_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Champions VARCHAR, Runner-up VARCHAR, Third Place VARCHAR, Top Goalscorer VARCHAR, Club VARCHAR) CREATE TABLE third_round (third_round_id AUTO_INCREMENT PRIMARY KEY, Place VARCHAR, Player VARCHAR, Country VARCHAR, Score VARCHAR, To par VARCHAR) CREATE TABLE broadcasting (broadcasting_id AUTO_INCREMENT PRIMARY KEY, Small season number INT, Time of broadcast VARCHAR, Days of the week VARCHAR, Hours VARCHAR, Length of episode VARCHAR, Picture format VARCHAR)  
SELECT Country FROM third_round WHERE Place = t6 AND Player = robert karlsson